export default class Blackboard
{
    private static _instance: Blackboard = null;
    static get instance()
    {
        if (this._instance === null)
        {
            this._instance = new Blackboard();
        }
        return this._instance;
    }
    hp: number = 100;
    mp: number = 100;
    constructor() {}
}

Blackboard.instance.hp